Analysing multiple before/after variables in SPSS - ANOVA?

#1
I'm using a large dataset with 12 pairs of variables that I'm interested in: a value of a particular factor before and after an intervention/control. So there's 'BeforeA', 'AfterA', 'BeforeB', 'AfterB' and so on.
I need to analyse these and show them in a before/after line graph with all the lines together. I've spent over a week trying to learn how to do an ANOVA or ANCOVA analysis (possibly one-way between subjects ANOVA?), I've watched and copied several videos but it's always returned error results and I have no idea if I'm using the right approach.
What method would you suggest in SPSS and can you direct me to a video demonstrating how to do it?
Thank you so much, this is exhausting me.
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Karabiner

TS Contributor
#2
Maybe you should describe your study in more detail first. What are the research questions,
what are the variables, how were data collected, how large is your sample size? And how is
your (SPSS-)datafile structured?

With kind regards

Karabiner